Sometime somewhere I saw a tool that would allow me to reach under a bathroom sink and turn off a very hard to turn cutoff valve. Believe it or not, I cannot get to the valve to turn it off unless I totally disassemble the plumbing, which I hope not to do. Does anyone know where to find that sort of tool? I don't even remember what it looked like, but it seem to have an oval pocket to engage the oval knob on the shutoff valve.
I'm sorry this explanation is not better.